This is the public key for RPMs released with CetnOS Linux
'rpm --import RPM-GPG-KEY-upi' to load the key with rpm,
then use 'rpm -K (packagename)' to verify package signatures.
The private key is owned by

pub  1024D/15F8505B 2005-01-13 Pasi Pirhonen (CentOS maintaining) <upi@iki.fi>
sub  2048g/404A5CD4 2005-01-13 [expires: 2015-01-11]

http://pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x15F8505B

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.2.1 (GNU/Linux)

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5cFJBQkSzAMAAAoJEOqYFAYV+FBbXfcAn00j5MhWhdinDTIqvLMnrkQt4iRuAJ0T
jQISkWQPmy+B6Ex98soYYwsbdA==
=1kKJ
-----END PGP PUBLIC KEY BLOCK-----